This is my first car, so don't laugh... is it normal for spare tire to release a strong unpleasant odor? Like rubber, but that got rotten, if such thing is even possible. At least I think it is the spare, the odor is coming from roughly that area. Do I need to treat it with something? Also it seems to have better and worse days, when it's not noticeable at all or very noticeable (at least for a couple of minutes, before AC pumps fresh air inside). If it's normal, I can live with it, it's not that bad... but I'd like to know if that's really the case?